Составьте уравнения по следующих схемам (расставьте коэффициенты):
1) NaNO3 → NaNO2 + O2
2) Li + N2 → Li3N
3) NH3 + O2 → N2 + H2O
4) BaCl2 + Na2SO4 → BaSO4 + NaCl
5) H3PO4 + NaOH → Na3PO4 + H2O
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